The buttons in the Zoom toolbar found in the Title Block Editor are described below:

Button Description
Zoom In button. Magnifies the elements on the workspace.
Zoom 100% button. Displays the items in the workspace at their normal viewing size. This is their display size in Multisim. When the Title Block Editor first opens, the magnification is set to 100%.
Zoom Out button. Reduces the viewing size of the element(s) on the workspace.